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  6.     <title>4.3.¬† Edge</title>
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  12.     <link rel="start" href="index.html" title="GNU Image Manipulation Program" />
  13.     <link rel="up" href="filters-edge.html" title="4.¬† Edge-Detect Filters" />
  14.     <link rel="prev" href="plug-in-dog.html" title="4.2.¬† Difference of Gaussians" />
  15.     <link rel="next" href="plug-in-laplace.html" title="4.4.¬† Laplace" />
  16.   </head>
  17.   <body>
  18.     <div class="navheader">
  19.       <table width="100%" summary="Navigation header">
  20.         <tr>
  21.           <th colspan="3" align="center">4.3.¬†
  22.     <span lang="en" xml:lang="en">Edge</span>
  23.   </th>
  24.         </tr>
  25.         <tr>
  26.           <td width="20%" align="left"><a accesskey="p" href="plug-in-dog.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  27.           <th width="60%" align="center">4.¬†
  28.     <span lang="en" xml:lang="en">Edge-Detect Filters</span>
  29.   </th>
  30.           <td width="20%" align="right">¬†<a accesskey="n" href="plug-in-laplace.html"><img src="../images/next.png" alt="Next" /></a></td>
  31.         </tr>
  32.       </table>
  33.       <hr />
  34.     </div>
  35.     <div class="sect2" lang="en" xml:lang="en">
  36.       <div class="titlepage">
  37.         <div>
  38.           <div>
  39.             <h3 class="title"><a id="plug-in-edge"></a>4.3.¬†
  40.     <span lang="en" xml:lang="en">Edge</span>
  41.   </h3>
  42.           </div>
  43.           <div>
  44.             <div class="revhistory">
  45.               <table border="1" width="100%" summary="Revision history">
  46.                 <tr>
  47.                   <th align="left" valign="top" colspan="3">
  48.                     <b>Revision History</b>
  49.                   </th>
  50.                 </tr>
  51.                 <tr>
  52.                   <td align="left">Revision $Revision: 2440 $</td>
  53.                   <td align="left">2008-04-01</td>
  54.                   <td align="left">ude</td>
  55.                 </tr>
  56.               </table>
  57.             </div>
  58.           </div>
  59.         </div>
  60.       </div>
  61.       <a id="id2735607" class="indexterm"></a>
  62.       <a id="id2735625" class="indexterm"></a>
  63.       <a id="id2735634" class="indexterm"></a>
  64.       <a id="id2735643" class="indexterm"></a>
  65.       <a id="id2735652" class="indexterm"></a>
  66.       <a id="id2735660" class="indexterm"></a>
  67.       <a id="id2735669" class="indexterm"></a>
  68.       <a id="id2735678" class="indexterm"></a>
  69.       <div class="sect3" lang="en" xml:lang="en">
  70.         <div class="titlepage">
  71.           <div>
  72.             <div>
  73.               <h4 class="title"><a id="id2735687"></a>4.3.1.¬†
  74.       <span lang="en" xml:lang="en">Overview</span>
  75.     </h4>
  76.             </div>
  77.           </div>
  78.         </div>
  79.         <p>
  80.       You can find this filter through
  81.       <span class="guimenu">Filters</span> ‚Üí <span class="guisubmenu">Edge Detect</span> ‚Üí <span class="guimenuitem">Edge...</span>.
  82.     </p>
  83.         <div class="figure">
  84.           <a id="id2735727"></a>
  85.           <p class="title">
  86.             <b>Figure¬†16.33.¬†
  87.         <span lang="en" xml:lang="en">Applying example for the Edge filter</span>
  88.       </b>
  89.           </p>
  90.           <div class="figure-contents">
  91.             <div class="mediaobject">
  92.               <img src="../images/filters/examples/taj_orig.jpg" alt="Applying example for the Edge filter" />
  93.               <div class="caption">
  94.                 <p>Original image</p>
  95.               </div>
  96.             </div>
  97.             <div class="mediaobject">
  98.               <img src="../images/filters/examples/edge-taj-edge-sobel.jpg" alt="Applying example for the Edge filter" />
  99.               <div class="caption">
  100.                 <p>After applying the filter (Sobel option)</p>
  101.               </div>
  102.             </div>
  103.           </div>
  104.         </div>
  105.         <br class="figure-break" />
  106.         <div class="figure">
  107.           <a id="id2735788"></a>
  108.           <p class="title">
  109.             <b>Figure¬†16.34.¬†
  110.         <span lang="en" xml:lang="en">Applying examples for the Edge filter</span>
  111.       </b>
  112.           </p>
  113.           <div class="figure-contents">
  114.             <div class="mediaobject">
  115.               <img src="../images/filters/examples/edge-taj-edge-prewitt.jpg" alt="Applying examples for the Edge filter" />
  116.               <div class="caption">
  117.                 <p>After applying the filter (Prewitt option)</p>
  118.               </div>
  119.             </div>
  120.             <div class="mediaobject">
  121.               <img src="../images/filters/examples/edge-taj-edge-gradient.jpg" alt="Applying examples for the Edge filter" />
  122.               <div class="caption">
  123.                 <p>After applying the filter (Gradient option)</p>
  124.               </div>
  125.             </div>
  126.           </div>
  127.         </div>
  128.         <br class="figure-break" />
  129.         <div class="figure">
  130.           <a id="id2735850"></a>
  131.           <p class="title">
  132.             <b>Figure¬†16.35.¬†
  133.         <span lang="en" xml:lang="en">Applying example for the Edge filter</span>
  134.       </b>
  135.           </p>
  136.           <div class="figure-contents">
  137.             <div class="mediaobject">
  138.               <img src="../images/filters/examples/edge-taj-edge-roberts.jpg" alt="Applying example for the Edge filter" />
  139.               <div class="caption">
  140.                 <p>After applying the filter (Roberts option)</p>
  141.               </div>
  142.             </div>
  143.             <div class="mediaobject">
  144.               <img src="../images/filters/examples/edge-taj-edge-differential.jpg" alt="Applying example for the Edge filter" />
  145.               <div class="caption"></div>
  146.             </div>
  147.           </div>
  148.         </div>
  149.         <br class="figure-break" />
  150.         <div class="figure">
  151.           <a id="id2735906"></a>
  152.           <p class="title">
  153.             <b>Figure¬†16.36.¬†
  154.         <span lang="en" xml:lang="en">Applying example for the Edge filter</span>
  155.       </b>
  156.           </p>
  157.           <div class="figure-contents">
  158.             <div class="mediaobject">
  159.               <img src="../images/filters/examples/edge-taj-edge-laplace.jpg" alt="Applying example for the Edge filter" />
  160.               <div class="caption">
  161.                 <p>After applying the filter (Laplace option)</p>
  162.               </div>
  163.             </div>
  164.           </div>
  165.         </div>
  166.         <br class="figure-break" />
  167.       </div>
  168.       <div class="sect3" lang="en" xml:lang="en">
  169.         <div class="titlepage">
  170.           <div>
  171.             <div>
  172.               <h4 class="title"><a id="id2735946"></a>4.3.2.¬†
  173.       <span lang="en" xml:lang="en">Options</span>
  174.     </h4>
  175.             </div>
  176.           </div>
  177.         </div>
  178.         <div class="figure">
  179.           <a id="id2735957"></a>
  180.           <p class="title">
  181.             <b>Figure¬†16.37.¬†
  182.         <span lang="en" xml:lang="en">Edge filter options</span>
  183.       </b>
  184.           </p>
  185.           <div class="figure-contents">
  186.             <div class="mediaobject">
  187.               <img src="../images/filters/edge-options.png" alt="Edge filter options" />
  188.             </div>
  189.           </div>
  190.         </div>
  191.         <br class="figure-break" />
  192.         <div class="variablelist">
  193.           <dl>
  194.             <dt>
  195.               <span class="term">Algorithm</span>
  196.             </dt>
  197.             <dd>
  198.               <p>
  199.             Edge detector offers several detection methods:
  200.           </p>
  201.               <div class="itemizedlist">
  202.                 <ul type="disc">
  203.                   <li>
  204.                     <p>
  205.                 <span class="guilabel">Sobel</span>: Here, this method has no options
  206.                 and so is less interesting than the specific Sobel.
  207.               </p>
  208.                   </li>
  209.                   <li>
  210.                     <p>
  211.                 <span class="guilabel">Prewitt</span>: Result doesn't look different
  212.                 from Sobel.
  213.               </p>
  214.                   </li>
  215.                   <li>
  216.                     <p>
  217.                 <span class="guilabel">Gradient</span>: Edges are thinner, less
  218.                 contrasted and more blurred than Sobel.
  219.               </p>
  220.                   </li>
  221.                   <li>
  222.                     <p>
  223.                 <span class="guilabel">Roberts</span>: No evident difference from Sobel.
  224.               </p>
  225.                   </li>
  226.                   <li>
  227.                     <p>
  228.                 <span class="guilabel">Differential</span>: Edges less bright.
  229.               </p>
  230.                   </li>
  231.                   <li>
  232.                     <p>
  233.                 <span class="guilabel">Laplace</span>: Less interesting than the
  234.                 specific one.
  235.               </p>
  236.                   </li>
  237.                 </ul>
  238.               </div>
  239.             </dd>
  240.             <dt>
  241.               <span class="term">
  242.           <span lang="en" xml:lang="en">Amount</span>
  243.         </span>
  244.             </dt>
  245.             <dd>
  246.               <p>
  247.             A low value results in black, high-contrasted image with thin
  248.             edges. A high value results in thick edges with low contrast and
  249.             many colors in dark areas.
  250.           </p>
  251.             </dd>
  252.             <dt>
  253.               <span class="term">
  254.           <span lang="en" xml:lang="en">Wrap, Smear, Black</span>
  255.         </span>
  256.             </dt>
  257.             <dd>
  258.               <p>
  259.             Where the edge detector will get adjoining pixels for its
  260.             calculations when it is working on the image boundaries. This
  261.             option will only have an effect on the boundaries of the result
  262.             (if any). <span class="guilabel">Smear</span> is the default and the best
  263.             choice.
  264.           </p>
  265.             </dd>
  266.           </dl>
  267.         </div>
  268.       </div>
  269.     </div>
  270.     <div class="navfooter">
  271.       <hr />
  272.       <table width="100%" summary="Navigation footer">
  273.         <tr>
  274.           <td width="40%" align="left"><a accesskey="p" href="plug-in-dog.html"><img src="../images/prev.png" alt="Prev" /></a>¬†</td>
  275.           <td width="20%" align="center">
  276.             <a accesskey="u" href="filters-edge.html">
  277.               <img src="../images/up.png" alt="Up" />
  278.             </a>
  279.           </td>
  280.           <td width="40%" align="right">¬†<a accesskey="n" href="plug-in-laplace.html"><img src="../images/next.png" alt="Next" /></a></td>
  281.         </tr>
  282.         <tr>
  283.           <td width="40%" align="left" valign="top"><a accesskey="p" href="plug-in-dog.html">4.2.¬†
  284.     <span lang="en" xml:lang="en">Difference of Gaussians</span>
  285.   </a>¬†</td>
  286.           <td width="20%" align="center">
  287.             <a accesskey="h" href="index.html">
  288.               <img src="../images/home.png" alt="Home" />
  289.             </a>
  290.           </td>
  291.           <td width="40%" align="right" valign="top">¬†<a accesskey="n" href="plug-in-laplace.html">4.4.¬†
  292.     <span lang="en" xml:lang="en">Laplace</span>
  293.   </a></td>
  294.         </tr>
  295.       </table>
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  299.